How would I go about adding new tokens to the game? Nothing fancy, just like recoloring the health tokens blue or something. My friends and I play with some added house rules, and we need extra tokens to keep track of some stuff.

Currently, we just use Vonkie's mod and add in extra health tokens, but I really want to mod in some new tokens just for our rules. Can anyone mod that for me, or point me in the right direction to get started?